“So happy to have captured this moment with my babies before Chris and I anxiously, excitedly, nerve-wrackingly welcomed our beautiful baby BOY into our hearts forever and ever 🙏🏼🙏🏼🙏🏼🙏🏼🙏🏼🙏🏼🙏🏼,” she wrote.

Coleman shared a car video of the couple getting ready for their son’s arrival, captioning it, “Pulling up to hospital for baby number 3 got me like. @hollyaudreywilliams still in her curlers looking fine and ready to deliver! Boy or girl? We’ll know in 2 hours.”

The daughter of Hank Williams Jr. (and granddaughter of Hank Williams) made her pregnancy news public in March, sharing a photo of herself sporting a visible baby bump under a gray sweatshirt.

A post shared by hollyaudreywilliams (@hollyaudreywilliams) on May 11, 2017 at 11:27am PDT

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Williams and fellow musician Coleman married in Nashville, Tennessee, in 2009. Following the birth of Stella in September 2014, the now-mother-of-three told PEOPLE that her name held a special meaning: her first was a nod to a great, great aunt, while her middle — June — was in honor of Williams’ maternal grandmother.

“She was the grandparent I was closest to by far and she was just such an amazing, lovely, southern dream of a grandmother to me,” said Williams. “It’s really important to teach my child about my grandparents and where they came from and why I was so close to them.”